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Question
Differentiate between spontaneous and stimulated emission.
Distinguish Between
Solution
| Sr.no. | Spontaneous emission | Stimulated emission |
| 1. | When an atom in an excited state makes a transition into ground state by emission of photon, without any external stimulus, it’s called spontaneous emission. | When an atom in an higher energy state is forced by a photon to make a transition into ground state resulting into emission of another photon is called stimulated emission. |
| 2. | It is not useful for LASER. | It is useful for LASER. |
| 3. | Spontaneous emission does not require an external electromagnetic stimulus to release energy | Stimulated emission does require external electromagnetic stimuli to release energy. |
| 4. | The probability of spontaneous emission to take place is higher than the probability for stimulated emission to take place | The probability of stimulated emission to take place is higher than the probability for spontaneous emission to take place |
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Spontaneous Emission and Stimulated Emission
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